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Brand advantage: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts

EPRO PR6423/003-030+CON021 probe sensor

Rotor E/F protection Settings: Overvoltage V-Setting Delay Delay Over/undervoltage Max Min The rotor E/F function in conjunction with the ancillary unit Type YWX 111 and 2 coupling capacitors is suitable for protecting synchronous generators regardless of the excitation system in use. The scheme operates according to the Wheatstone bridge principle and is uninfluenced by frequency. The harmonics of the excitation system do not therefore effect the rotor E/F protection. The bridge is connected to the rotor circuit by one or two highvoltage capacitors. The first leg of the bridge consists of the coupling capacitors and the capacitance of the rotor winding in series. The second capacitive leg, the resistive legs and a supply transformer for stepping down the v.t. voltage (e.g. 100 V) to the 50 V needed for the measuring circuit are in the ancillary unit Type YWX 111. A second transformer isolates the bridge from the input of the E/F protection function. An E/F short-circuits the capacitance of the rotor winding and the bridge is no longer balanced. There is thus a voltage across the bridge, which is detected by the overvoltage function. Depending on the design of the scheme, the pick-up setting is between 0.5 and 3 V to detect an insulation leakage of 1 k, which is considered as being an E/F. The voltage setting for the scheme is therefore determined during commissioning

Interturn protection

 (voltage principle) Settings: Overvoltage V-Setting Delay Delay The purpose of the interturn protection is to detect short-circuits between the turns of the generator stator windings. The scheme should be as sensitive as possible to detect the majority of interturn faults. However, because of various residual voltages caused by asymmetries, the setting may not be lower than 5 % UN. A slight delay will prevent false tripping due to transients. Both ends of the primaries of v.t's must be designed for the full HV potential! Since the star-points of the generator and the v.t's are connected, the high short-circuit power of the generator would cause severe damage in the event of an interturn fault on a v.t. primary. HV fuses should therefore be inserted in the v.t. primaries. Typical settings: V-Setting 0.05 UN Delay

Peak value overvoltage (Voltage-Inst) A. Application
General voltage monitoring with instantaneous response (over and under)
Voltage monitoring where insensitivity to frequency is required (over and under). B. Features
processes instantaneous values and therefore fast and largely independent of frequency
stores the peak value following pick-up
no suppression of DC component
no suppression of harmonics
single and three-phase measurement
maximum value detection in the three-phase mode
adjustable lower frequency limit fmin.